Aspherical spectacle lens

Details Aspherical spectacle lens Aspherical spectacle lens

1997-01-13

1998-10-20

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 702

Patent

active

058254544

ABSTRACT:
An aspherical spectacle lens that has a pair of first and second refractive surfaces, one or both of which have an aspherical shape. In this lens, the first refractive surface and/or the second refractive surface is defined by the following equation: ##EQU1## where mi designates a real number which is not less than 2; n an integer which is not less than 1; X a length of a perpendicular drawn from a point, which is positioned on the aspherical surface and is located at a distance .rho. from an optical axis, to a meridional plane, which contacts the aspherical surface at a vertex thereof; C curvature at the vertex of the aspherical surface; .rho. a distance from the optical axis; k what is called a cone constant; and A.sub.mi what is called an aspherical-surface coefficient of .rho..sup.mi. Thus, there is provided an aspherical spectacle lens in which decentration aberration is small. Moreover, the design of the lens is performed by taking oblique astigmatic error and mean oblique error due to decentration into consideration. Thus, the performance degradation due to the decentration occurring in the aspherical lens can be reduced.

REFERENCES:
patent: 4784482 (1988-11-01), Guilino

Affiliated with

Also associated with

Rating

Aspherical spectacle lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Aspherical spectacle lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aspherical spectacle lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-250435